Rubbing mill



H. GABLER RUBBING MILL April 26, 1932.

Filed Dec. 4, .1929 2 Sheets-Sheet Inventor lfans Gdbler,

Adar/2g.

H. GABLER RUBBING MILL April 26, 1932.

Filed De'c. 4, 1929 2 Sheets-Sheet 2 Patented Apr. 26, 1932 UNITED STATES PATENT OFFICE HANS GKIBLER, OF HELMSTEDT, GERMANY, ASSIGNOR TO WEBER & SEELKNDER, MASCHINENFABRIK, OF HELMSTEDT, G-EIEHVIZAIQ'Y RUBBING. MILL Application filed December 4, 1929, Serial No. 411,630, and in Germany December 1, 192 8.

My invention relates to improvements in rubbing mills, and more particularly in mills designed for rubbing and mixing material such as soap, and comprising a plurality of rolls in rubbing engagement with one another. The object of the improvements is to provide a mill by means of which the mate rial is sufficiently refined and intermittently mixed by once passing through the mill, and in which neither the rolls nor the material are materially heated, the said rolls being rotated at low circumferential velocity. With this object in view my invention consists in providing a pair of rolls of large diameter rolling in contact with each other and at different circumferential velocities, each roll being in rolling engagement with a plurality of rolls of comparatively small diameter, the small rolls cooperating with the large roll of smaller circumferential velocity having a smaller circumferential velocity than the cooperating large roll, and the small rolls cooperating with the large roll of greater circumferential velocity having a greater circumferential velocity than the cooperating large roll. Between successive small rolls scrapers are provided which bear on the surfaces of the large or small rolls and scrape the material therefrom after each rubbing operation and allow the same to drop into boxes in which the rubbed and scraped materials are mixed, and from which it is supplied to the next rubbing position.

For the purpose of explaining the invention an example embodying the same has been illustrated in the accompanying drawings showing a diagrammatical elevation of the mill.

Fig. I is a vertical section of the entire mill; Fig. II is a plan view.

In the example shown in the drawings the mill comprises rolls 0 and 0 of large and equal diameters having fixed bearings, and the said rolls are provided with driving mechanisms imparting a greater circumferential velocity 21 to the roll 0 than to the roll 0 the circumferential velocity of which is '0 The roll 0 of smaller circumferential velocity is in rolling engagement with three circumferentially shiftably mounted rolls 0 0 0 having equal circumferential velocities v '0 n, the said circumferential velocities 11 ,22 a) being smaller than the circumferential velocity v? of the roll 0 The large rollo is' in rolling engagement with 5 four small rolls 0 .0 0 0", the circumferential velocities v, '0 (0 o of which are either equal or substantially equal and greater than the circumferential velocity '0 of the large roll ,0 The material to be rubbed is supplied through a funnel a, and between thesuccessive rolls of small diameter there are scrapers Z2 b b b 12 and hoppers a a a a a for collecting the scraped mate rial and supplying the same to the next pair of rolls. The scrapers b and b engagethe 1 1M? an th s rap s ,1 ag th small rolls'p 0 0 t In the operation .of the mill the material is taken into the funnel .a, and it issupplied 1o he f m o the o ls hi uc essiv ly rub the same at the points 1 to 8.

After passing pair of rubbing rolls the material 'is scraped by the scrapers b to b and dropped into the boxes a to a before a being supplied to the next pair of rubbing rolls. Within the said hoppers the partly rubbed material is intimately mixed. Finally a scraper c removes the material from the last roll 0 I have found that by once passso ing the material through the mill it is thoroughly rubbed and intimately mixed.

I claim:

1. In a mill for mixing plastic material, a pair of coacting large rolls arranged with as their axes at different vertical levels, the upper roll having a higher peripheral speed than the lower, a series of small rolls engaging the upper large roll and driven faster than said roll, a series of small rolls engag- 9o ing the lower large roll and driven more slow- 1y than said roll, hoppers between pairs of small rolls of the lower series for feeding material to a mixing point, means acting on the lower large roll adjacent each hopper for re- '95 moving the plastic material therefrom and depositing it in said adj acent hopper, hoppers between pairs of small rolls of the upper series for feeding material to a mixing point,

and means adjacent the respective hoppers 51 0,

acting on the small rolls for removing the material therefrom and depositing it in said respective hoppers.

2. In a mill for mixing plastic material, the combination of a pair of coacting rolls of relatively large diameter having their axes spaced vertically, the upper roll having greater speed than the lower, a series of small rolls engaging the upper roll and having greater peripheral velocity than the coacting large roll, a series of small rolls engaging the lower large roll and having smaller peripheral speed than the coacting large roll, means for feeding material to the lower large roll, hoppers between successive pairs of small rolls for feeding material to the next mixing point, and means adjacent each hopper for removing material from a roll for feeding said material to the adjacent hopper.

3. In a mill for mixing plastic material, the combination of a pair'of coacting rolls of relatively large diameter having their axes spaced vertically, the upper roll having greater speed than the lower, a series of small rolls engaging the upper roll and having greater peripheral velocity than the coacting large roll, a series of small rolls engaging the lower large roll and having smaller peripheral speed than the coacting large roll, means for feeding material to the lower large roll, and scraping means acting on a roll after each mixing operation said scraping means projecting the material toward the next mixing point, the last scraping means projecting the mixed material out of the machine.

In testimony whereof I' have aflixed my signature.

HANS GABLER. 

